A certain mother and son story. For her married eldest son Yasuhiro, she remodeled the house into a multi-generational home and started living with his wife Sarina. However, her husband Tatsuo has been hitting on Sarina but isn't getting anywhere. But because of this, she gets to spend time with her beloved Yasuhiro… The mother's excessive love for her son. In trying to respond to it, she realizes that she is more voluptuous and wonderful than her son's wife, Sarina. From then on, burying herself in her mother's abundant body became a daily routine…
